Computer-aided simultaneous engineering for components manufactured in small and medium lot sizes
Subramanyam, Sridhar
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Permalink
https://hdl.handle.net/2142/19838
Description
Title
Computer-aided simultaneous engineering for components manufactured in small and medium lot sizes
Author(s)
Subramanyam, Sridhar
Issue Date
1989
Doctoral Committee Chair(s)
Lu, Stephen C-Y
Department of Study
Mechanical Science and Engineering
Discipline
Mechanical Science and Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Industrial
Engineering, Mechanical
Engineering, System Science
Artificial Intelligence
Language
eng
Abstract
Simultaneous Engineering addresses the issue of developing the lowest cost design of a part by concurrently taking into consideration different product life-cycle concerns during the product developmental process. When only functional, structural, and machining life-cycle concerns are considered, Simultaneous Engineering entails concurrent product and process design. The objective of this research is to study and propose a methodology for the simultaneous product and process design of components manufactured in small and medium lot-sizes. For such components, Simultaneous Engineering is the process of ensuring that these parts are manufacturable for the lowest possible cost in specially designed facilities such as manufacturing cells.
A computer-based design environment encapsulating the expertise of process planners has been developed to cooperatively assist designers in developing manufacturable product designs. Model-based reasoning is the fundamental methodology employed to develop the framework of this design environment. Explicit models to describe product designs and manufacturing facilities have been developed to support the reasoning process. A combination of feature-based, geometric, and process performance models is proposed to satisfy the basic requirements. The reasoning subsystem is based on the Multiple Cooperative Knowledge Sources (MCKS) paradigm, with explicit separation of domain and control knowledge. Domain knowledge sources deal with the product and process refinement activities, and a control knowledge source deals with managing the concurrency between these two tasks. Appropriate justifications are provided in this research for the modeling and reasoning mechanisms chosen. The design environment has been tested and validated mainly by implementing it for the simultaneous product and process design for Bearing Cages. Several observations made about the general characteristics of the design environment, its impact on the product and process designer, and the unique nature of the knowledge acquisition task are discussed in detail and suitable recommendations are provided for future research directions.
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